error: called `filter(p).map(q)` on an `Iterator`. This is more succinctly expressed by calling `.filter_map(..)` instead.
  --> $DIR/filter_methods.rs:14:21
   |
14 |     let _: Vec<_> = vec![5; 6].into_iter().filter(|&x| x == 0).map(|x| x * 2).collect();
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `-D clippy::filter-map` implied by `-D warnings`

error: called `filter(p).flat_map(q)` on an `Iterator`. This is more succinctly expressed by calling `.flat_map(..)` and filtering by returning an empty Iterator.
  --> $DIR/filter_methods.rs:16:21
   |
16 |       let _: Vec<_> = vec![5_i8; 6]
   |  _____________________^
17 | |         .into_iter()
18 | |         .filter(|&x| x == 0)
19 | |         .flat_map(|x| x.checked_mul(2))
   | |_______________________________________^

error: called `filter_map(p).flat_map(q)` on an `Iterator`. This is more succinctly expressed by calling `.flat_map(..)` and filtering by returning an empty Iterator.
  --> $DIR/filter_methods.rs:22:21
   |
22 |       let _: Vec<_> = vec![5_i8; 6]
   |  _____________________^
23 | |         .into_iter()
24 | |         .filter_map(|x| x.checked_mul(2))
25 | |         .flat_map(|x| x.checked_mul(2))
   | |_______________________________________^

error: called `filter_map(p).map(q)` on an `Iterator`. This is more succinctly expressed by only calling `.filter_map(..)` instead.
  --> $DIR/filter_methods.rs:28:21
   |
28 |       let _: Vec<_> = vec![5_i8; 6]
   |  _____________________^
29 | |         .into_iter()
30 | |         .filter_map(|x| x.checked_mul(2))
31 | |         .map(|x| x.checked_mul(2))
   | |__________________________________^

error: aborting due to 4 previous errors